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Nissan Sentra B18 (2020-2025) Service Manual: High Pressure Fuel Pump

Component Function Check

Component Function Check

  1. CHECK HIGH PRESSURE FUEL PUMP FUNCTION

    With CONSULT

    1. Start engine.

    2. Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the indication as per the following conditions.

      Monitor item

      Condition

      Indication

      FUEL PRES SEN V

      At idle

      0.820 – 1,140 V

      Revving engine up to 4,000 rpm quickly.

      0.820 – 2,900 V

    Without CONSULT

    1. Start engine.

    2. Check the voltage between ECM terminals as per the following conditions.

      ECM

      Condition

      Voltage

      Connector

      +

      −

      Terminal

      F25

      67

      68

      [Engine is running]

      • Warm-up condition

      • Idle speed

        Note:

        The pulse cycle changes depending on rpm at idle.

      [Engine is running]

      • Warm-up condition

      • Engine speed: 2,000 rpm

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Turn ignition switch OFF.

    2. Check that the following fuse is not blowing.

      Fuse No.

      Capacity

      #68

      10 A

    Is the fuse blown (open)?

    YES >>

    Replace the fuse after repairing the applicable circuit.

    NO >>

    GO TO 2.

  2. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY

    1. Turn ignition switch ON.

    2. Check the voltage between ECM harness connector and ground.

      +

      −

      Voltage

      ECM

      Connector

      Terminal

      F25

      66

      Ground

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 9.

    NO >>

    GO TO 3.

  3. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect high pressure fuel pump relay harness connector.

    4. Check the continuity between ECM harness connector and high pressure fuel pump relay harness connector.

      ECM

      High pressure fuel pump relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      66

      F61

      2

      Existed

    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE)

    Check the voltage between high pressure fuel pump relay harness connector and ground.

    +

    −

    Voltage

    High pressure fuel pump relay

    Connector

    Terminal

    F61

    1

    Ground

    Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Perform the trouble diagnosis for power supply circuit.

  5. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE)

    1. Install all removed parts.

    2. Turn ignition switch ON.

    3. Check the voltage between high pressure fuel pump relay harness connector and ground.

      +

      −

      Voltage

      High pressure fuel pump relay

      Connector

      Terminal

      F61

      3

      Ground

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 6.

  6. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)

    1. Turn ignition switch OFF.

    2. Disconnect IPDM E/R harness connector.

    3. Disconnect high pressure fuel pump relay harness connector.

    4. Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness connector.

      IPDM E/R

      High pressure fuel pump relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F96

      73

      F61

      3

      Existed

    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    Perform the trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  7. CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect high pressure fuel pump relay harness connector.

    3. Check the continuity between high pressure fuel pump relay harness connector and ground.

      High pressure fuel pump relay

      —

      Continuity

      Connector

      Terminal

      F61

      4

      Ground

      Existed

    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair or replace malfunctioning part.

  8. CHECK HIGH PRESSURE FUEL PUMP RELAY

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace high pressure fuel pump relay.

  9. CHECK ECM GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between ECM harness connector and ground.

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 10.

    NO >>

    Repair or replace malfunctioning part.

  10. CHECK HIGH PRESSURE FUEL PUMP CIRCUIT

    1. Disconnect high pressure fuel pump relay harness connector.

    2. Check the continuity between ECM harness connector and high pressure fuel pump harness connector.

      ECM

      High pressure fuel pump

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      67

      F32

      1

      Existed

      68

      2

    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair or replace malfunctioning part.

  11. CHECK HIGH PRESSURE FUEL PUMP

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 12.

    NO >>

    Replace high pressure fuel pump. Refer to Removal and Installation.

  12. CHECK HIGH PRESSURE FUEL PUMP INSTALLATION

    1. Turn ignition switch OFF.

    2. Check high pressure fuel pump for improper attachment or looseness.

    Is the inspection result normal?

    YES >>

    GO TO 13.

    NO >>

    Repair or replace malfunctioning part.

  13. CHECK CAMSHAFT

    1. Remove camshaft. Refer to Removal and Installation.

    2. Check camshaft. Refer to Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace camshaft. Refer to Removal and Installation.

Component Inspection

Component Inspection

  1. CHECK HIGH PRESSURE FUEL PUMP-1

    1. Turn ignition switch OFF.

    2. Disconnect high pressure fuel pump harness connector.

    3. Check the resistance between high pressure fuel pump terminals as per the following conditions.

      High pressure fuel pump

      Condition

      Resistance

      Terminal

      1

      2

      Temperature [°C (°F)]

      20 – 30 (68 – 86)

      0.46 – 0.51 Ω

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Replace high pressure fuel pump. Refer to Exploded View.

  2. CHECK HIGH PRESSURE FUEL PUMP-2

    With CONSULT

    1. Reconnect high pressure fuel pump harness connector.

    2. Start engine.

    3. Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the indication as per the following conditions.

      Monitor item

      Condition

      Indication

      FUEL PRES SEN V

      At idle

      0.820 – 1.140 V

      Revving engine up to 4,000 rpm quickly.

      0.820 – 2.900 V

    Without CONSULT

    1. Start engine.

    2. Check fuel rail pressure sensor signal voltage.

    ECM

    Condition

    Voltage

    (Approx.)

    Connector

    +

    −

    Terminal

    F24

    44

    45

    [Engine is running]

    • Warm-up condition

    • Idle speed

    0.82 – 1.14 V

    [Engine is running]

    • Warm-up condition

    • Engine speed: Revving engine from idle to 4,000 rpm

    0.82 – 2.90 V

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace high pressure fuel pump. Refer to Exploded View.

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